Nikko Cedar Avenue (Suginamiki Kaido)

The Nikko Cedar Avenue, known in Japanese as Nikko Suginamiki Kaido, is one of the most extraordinary living monuments in Japan: a set of tree-lined historic roads bordered by around thirteen thousand towering cedars, planted roughly four centuries ago and stretching a combined total of some thirty-five kilometres. It holds the Guinness World Record as the longest tree-lined avenue on Earth, and to walk beneath its soaring cryptomeria is to pass through a green cathedral of living history.

The avenue is not a single road but three separate cedar-lined sections that converge on Nikko: the Nikko Kaido, the Nikko Reiheishi Kaido and the Aizu Nishi Kaido, the historic highways that carried pilgrims, officials and processions toward the great shrines. The trees were planted in the first half of the seventeenth century by a devoted retainer named Matsudaira Masatsuna, who over more than two decades lined the approaches to Nikko Toshogu with cedar saplings as an offering to the memory of Tokugawa Ieyasu, the founder of the shogunate who is enshrined there. Unable to donate lavish treasures as other lords did, he gave instead these trees, which would grow for centuries into a gift of incomparable grandeur.

Today those cedars have matured into giants, their trunks massive and their canopies meeting overhead to form long, shaded tunnels of green. The roads they line were the ceremonial and practical approaches to Nikko, and walking or driving through them evokes the journeys of the countless pilgrims and imperial messengers, the 'reiheishi', who once travelled them to pay respects at the shrine. Interpretive markers and the sheer scale of the trees convey both the antiquity and the devotion behind the planting.

The avenue is also a protected natural and cultural treasure, designated as both a Special Historic Site and a Special Natural Monument, a rare dual honour reflecting its importance to both history and the environment. Many of the individual cedars are catalogued and cared for, and considerable effort goes into preserving them against the pressures of age, weather, disease and modern road traffic. Some trees have inevitably been lost over the centuries, but the great majority endure, and the avenue remains a powerful symbol of continuity between Edo-period Japan and the present.

The visiting experience varies with the section. Parts of the avenue run alongside busy modern roads, but quieter, well-preserved stretches survive where visitors can stroll on foot beneath the trees in relative peace, feeling the cool, hushed atmosphere and the play of filtered light through the high canopy. These walking sections, reachable from the Imaichi area and points along the old Nikko Kaido, are the most rewarding, closing overhead into a dim green corridor that feels worlds away from the traffic. The going is easy and level, suitable for a gentle walk of half an hour or so.

The cedars are evergreen, so the avenue is impressive year-round, but it is at its most beautiful in the fresh green of early summer and on misty mornings, when fog drifts between the trunks and lends the ancient road an ethereal, almost otherworldly quality. For travellers approaching Nikko's celebrated shrines, taking time to experience the cedar avenue adds a profound sense of scale and history, a reminder that the journey to Nikko has been a grand and reverent one for four hundred years.